Question

Знайти значення виразу 4x²+2x-7 якшо x=0.5;1;-1.

Answer 1

Если x=0,5

4•0,25+2•0,5-7=1+1-7=-5

Если x=1

4•1+2•1-7=6-7=-1

Если x=-1

4•1+2•(-1)-7=4-2-7=-5

Answer 2

To find the values of the expression 4x² + 2x - 7 for the given values of x (0.5, 1, -1), simply substitute each value of x into the expression and perform the calculations.

1. For x = 0.5: 4 * (0.5)² + 2 * (0.5) - 7 = 4 * 0.25 + 1 - 7 = 1 + 1 - 7 = -5

2. For x = 1: 4 * (1)² + 2 * (1) - 7 = 4 * 1 + 2 - 7 = 4 + 2 - 7 = -1

3. For x = -1: 4 * (-1)² + 2 * (-1) - 7 = 4 * 1 - 2 - 7 = 4 - 2 - 7 = -5

So, the values of the expression for x = 0.5, 1, and -1 are -5, -1, and -5 respectively.