Advertisements
Advertisements
Question
If x = − 6, evaluate:
3x2 + 8x
Sum
Advertisements
Solution
3x2 + 8x
= (3 × x × x) + (8 × x)
= (3 × (− 6) × (− 6)) + (8 × (− 6))
= − 108 + (− 48)
= 60
shaalaa.com
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
If p = -2, find the value of -2p3 - 3p2 + 4p + 7.
Find the value of the following expression, when x = -1:
x2 + 2x + 1
Simplify this expression and find its value if x = 3, a = -1, b = -2.
2 - 8x + 4x + 4
If p = −10, find the value of p2 − 2p − 100.
If x = 4, evaluate:
12x + 7
If x = 4, evaluate:
`"x"^2/8`
If m = 2, evaluate:
15m2 – 10m
If m = – 7, evaluate:
2m3
If x = 5 and y = 4, evaluate:
8xy
If m = 9 and n = − 2, evaluate (2n)3
