Question

Simplify: 3x(4x+5) and find its value for a) x=1/2

Answer 1

Answer:

21/2

Explanation:

i ) 3x(4x+5)

= 12x²+15x

if x = 1/2 ,then the

value of 3x(4x+5)

= 12x²+15x

= 12(1/2)²+15(1/2)

= 12/4 + 15/2

= (12+30)/4

= 42/4

= 21/2

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