Question

(2+3х)(5-х)+3(х-1)^2 при х=-0.5

Answer 1

...=10-2x+15x-3x²+3x²-6+3=7+13x=-0,5*13+7=-6,5+7=0,5.

Answer 2

To evaluate the expression (2+3x)(5-x)+3(x-1)^2 at x = -0.5, we substitute the value of x into the expression and perform the necessary calculations.

Given: x = -0.5

Let's substitute the value of x into the expression:

(2 + 3(-0.5))(5 - (-0.5)) + 3((-0.5) - 1)^2

Simplifying:

(2 - 1.5)(5 + 0.5) + 3(-1.5)^2 (0.5)(5.5) + 3(-1.5)^2 2.75 - 3(2.25)

Calculating:

2.75 - 6.75 -4.00

Therefore, when x = -0.5, the value of the expression (2+3x)(5-x)+3(x-1)^2 is -4.00.