9. (a) Factorise 5a2−3a−14 by using cross method.
(2 mark
(b) Hence, factorise 5(x−2)2−3(x−2)−14
(a) 5a2−3a−14=(5a+7)(a−2)+(1M for showing cross method)
(b) Let a be (x−2)
(4 marks)
(1M)
∴5(x−2)2−3(x−2)−14=[5(x−2)+7][(x−2)−2)]=[5x−10+7](x−4)=(5x−3)(x−4) 10. Determine whether 43x−1−32x+5=12x−23 is an identity.
L. H.S. =43x−1−32x+5
(4 marks)
=123(3x−1)−124(2x+5)=129x−3−8x−20=12x−23= R. H.S. ∴ It is an identity.
(1 ft) 11. If 5x2−(A+B)x+B≡(Cx+3)(x−4), where A,B and C are constants, find A,B and C. ( 5 marks)
L.H.S. =5x2−(A+B)x+B R.H.S. =(Cx+3)(x−4)=Cx2−4Cx+3x−12=Cx2+(3−4C)x−12∴5x2−(A+B)x+B≡Cx2+(3−4C)x−12 Comparing the like terms on both sides, we have
B=−12,C=5−(A+B)=3−4C−A−B=3−4C−A−(−12)=3−4(5)A=29
(2A for all correct, 1 A for 2 correct) 12. Simplify 15n4m+6m2÷(5m+2n)(5m−2n)−2n−3mn×8n−20m6mn. (5 marks)
15n4m+6m2÷(5m+2n)(5m−2n)−2n−3mn×8n−20m6mn=15n4m+6m2×−2n−3mn(5m+2n)(5m−2n)×8n−20m6mn=15n2m(2+3m)×−n(2+3m)(5m+2n)(5m−2n)×4(2n−5m)6mn=5nm2(5m+2n)
1. NO CALCULATOR This expression is used to calculate the taxes on Marta's monthly earnings, where c represents the commission on her sales. Which expression is equivalent?
31(1650+0.15c) 1,650.33+0.48c550+0.15c550+0.05c4,950+0.45c
Which of the following expressions is NOT equivalent to sin75∘ ?
a. sin45∘+sin30∘
b. sin(45∘+30∘)
c. sin45∘cos30∘+sin30∘cos45∘
d. sin105∘ 2. Simplify the expression 1+tan85πtan83πtan85π−tan83π.
A. 0
o. undefined
b. 1
d. -1 3. Which expression is a proper simplification of 2sin2xcos2x ? 4. Pactor the expression 81−16sin2θ.
a. (9−4sinθ)2
c. (3−2sin2θ)4
я. sin2x
b. 3(27−5sin2θ)
d. (9+4sinθ)(9−4sinθ)
b. sin(4x)
c. sin(2x)
d. sinx
www-awu.aleks.com/alekscgi/x/lsl.exe/1o_u Exponants and Pefyromials
Introduction to the power rules of exponente Simplifi.
(x2)3 Write your answer without parentheses.
11. The partial fractional decomposition of the expression
x4−163x2−2x+1
is
(a) x+2A+x−2B+x2+4C.
(b) x+2A+x−2B+x2+4Cx+D.
(c) x2−4Ax+B+x2+4Cx+D.
(d) x+2B+x−2B+(x+2)2C+(x−2)2D.
(e) x4−16A+Bx+Cx2+Dx3.
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5 of 5 Match the simplified expression with the correct problem.
43(8x+16)2x−5x+5−4x+x+x+3+5−23+2(2x+5)9x−24x+13−3x+16x+123x+6
Jeana's calculator display shows the number to the right.
a. Express this number in scientific notation.
b. Express this number in standard form.
a. The number written in scientific notation is □.
(Use scientific notation. Use the multiplication symbol in the math palette as needed,)
1. Rewrite each expression as an equivalent expression with a positive exponen
a) 5−4
c) 2−41
e) (113)−1
b) (−101)−3
d) −(56)−3
f) 8−17−2 2. Write each expression as a single power with a positive exponent.
a) (−10)8(−10)−8
c) 2−528
e) (−94)−1
b) 6−7×65
d) 11511−3
f) [(7−3)−2]−2 3. Which is the greater power, 2−5 or (21)−5 ? Explain.
Whole Numbers
Progress:
Questo The movement of the progress bar may be uneven because questions can be worth more or less (induding zero) depending an your onswer:
Match each expression on the left with its equivalent on the right. Some answer choices on the right will not be used.
8,200×100820,000÷10820×1082,000÷1,000828208,20082,000820,0008,200,000 Clear
Click and hold an item in one colwm, then arag it to the matching item in the other colwnn be sure your cursor is over 2 target before releasing. The target will highight or the cursor will change Need help? Wiltch shis videa
Progress: The movement of the progress bar may be uneven because questions can be worth more or less (including zero) depending on your answer.
How could you correctly rewrite the equation 4(5+3)=2(22−6) using the distributive property?
20+18=44−620+12=44−1212+20=−12+4420+3=44−6
Factor the expression 4z2+24z−28. Simplify your answer as much as possible, and put the greatest common factor in the first answer box.
□(□)(□ ) help (formulas)