Question

find its value for a) x=3 b)x= one by two . 3x(4x-5) +3

Answer 1

A) x=3
3x(4x-5)+3
3*3*4*3-5+3
106 is answer

B) 1/2
3*1/2*4*1/2-5+3
1 is your answer.

Answer 2

$first \: a)where \: x = 3 \: \: \: then \: \\ 3x(4x - 5) + 3 \\ = 3(3)(4(3) - 5) + 3 \\ = 9(12 - 5) + 3 \\ = 9(7) + 3 \\ = 66 \\ secondly \: where \:b)x = \frac{1}{2} \\ 3x(4x - 5) + 3 \\ = \frac{3}{2} ( \frac{4}{2} - 5) + 3 \\ = \frac{3}{2} ( \frac{4 - 10}{2} ) + 3 \\ = \frac{3}{2} (3) + 3 \\ = \frac{9}{2} + 3 \\ = \frac{9 + 6}{2} \\ = \frac{15}{2} \\ = 7.5$