Question

7n²-(3nm-2n²)+(4nm-9n²), якщо n =-1/8; m=-32​

Answer 1

Пояснення:

7n²-(3nm-2n²)+4nm-9n²=7n²-3nm+2n²+4nm-9n²=9n²+nm-9n²=nm

Підставимо числові значення m та n:

nm=-1/8*-32= 32/8=4

Відповідь: 4

Answer 2

To evaluate the expression 7n² - (3nm - 2n²) + (4nm - 9n²) with n = -1/8 and m = -32, we substitute the given values into the expression:

n = -1/8 m = -32

7n² - (3nm - 2n²) + (4nm - 9n²) = 7(-1/8)² - (3(-1/8)(-32) - 2(-1/8)²) + (4(-1/8)(-32) - 9(-1/8)²)

To simplify further, let's calculate the individual terms:

(-1/8)² = 1/64 (-1/8)(-32) = 4 (-1/8)² = 1/64 (-1/8)(-32) = 4

Substituting these values back into the expression:

= 7(1/64) - (3(4) - 2(1/64)) + (4(4) - 9(1/64)) = 7/64 - (12 - 2/64) + (16 - 9/64) = 7/64 - 12 + 2/64 + 16 - 9/64 = (7 - 12 + 2 + 16 - 9)/64 = 4/64 = 1/16

Therefore, when n = -1/8 and m = -32, the expression 7n² - (3nm - 2n²) + (4nm - 9n²) evaluates to 1/16.