Question

If the value of b is 7, then what is the value of the expression -3b2 + 25 = ? 

A. 17   B. –122   C. 122   D. 172. −3(7)2+25−3×49+25−147+25−122​
B.-122

Answer 1

B

substitute b = 7 into the expression and evaluate

- 3 × (7)² + 25 = (- 3 × 49 ) + 25 = - 147 + 25 = - 122 → B