____18. What is the value of a² + 12b – 5 if a = -5 and b = 4?
A. 82 C. -68
B. 68 D. – 82
____19. Which is equivalent to 5x³ -6x² + 8 if x = 2?
A. 72 C. -24
B. 24 D. -72
____20. What is the value of 7x + 6y - 3 if x = 4 and y = 5?
A. 55 C. 58
B. 56 D. 59
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A. 82 C. -68
B. 68 D. – 82
____19. Which is equivalent to 5x³ -6x² + 8 if x = 2?
A. 72 C. -24
B. 24 D. -72
____20. What is the value of 7x + 6y - 3 if x = 4 and y = 5?
A. 55 C. 58
B. 56 D. 59
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Answer:
18) B
a²+12b-5 ; a=-5 ,b= 4
(-5)² + 12(4) -5
25 + 48 -5
68
19)B
5x³ -6x² +8 ; x=2
5(2³)-6(2²) +8
5(8)-6(4)+8
40-24+8
16+8
24
20)A
7x+6y-3; x=4 ,y=5
7(4)+6(5)-3
28+30-3
58+3
55
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