Question

simplify 3x(4x-5)+3 and find its value for x=3 and x =½​

Answer 1

Answer:

Step-by-step explanation:

(a) x = 3

⇒ 3x(4x - 5) + 3

⇒ 3 × 3(4 × 3 - 5) + 3   [put the value of x = 3]

⇒ 9(12-5 )+ 3

⇒ 9 × 7 + 3

⇒ 63 + 3

⇒ 66

Now,

(b)  x =  1/2

⇒ 3x(4x - 5) + 3

⇒ 3 × 1/2 (4 × 1/2 - 5) + 3  [put the value of x = 1/2]

⇒  3/2(2 - 5) + 3

⇒ 3/2(-3) + 3

⇒ -9/2 + 3

⇒  -9+6/2

⇒ -3/2

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Answer 2

Answer:

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