Question

(2a-8b)в квадрате - 6a в квадратепри а= 15b= 7​

Answer 1

(2а-8b)² - 6a², при а = 15, b = 7.

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(2*15-8*7)²-6*15²= (30-56)²-6*225= (-26)²-1350=676 - 1350 =-674

Answer 2

To evaluate the expression (2a-8b)^2 - 6a^2 with a = 15 and b = 7, we substitute the given values into the expression and perform the calculations.

First, let's substitute the values of a and b into the expression:

(2a - 8b)^2 - 6a^2 = (2(15) - 8(7))^2 - 6(15)^2

Now, let's simplify the expression step by step:

= (30 - 56)^2 - 6(225)

= (-26)^2 - 6(225)

= 676 - 6(225)

= 676 - 1350

= -674

Therefore, when a = 15 and b = 7, the value of the expression (2a-8b)^2 - 6a^2 is -674.