Question

5x²+ 4y² at x = −2 and y = −2​

Answer 1

Answer:

5 x 4 + 4 x 4 = 36 minus minus will become plus so like this

Answer 2

Correct Question :-

Find the value of 5x² + 4y², If

• x = -2.

• y = -2.

Answer :-

Put these Values to get your answer.

➙ 5x² + 4y²

➙ 5(-2)² + 4(-2)²

➙ 5(-2 × -2) + 4(-2 × -2).

➙ 5 × 4 + 4 × 4.

➙ 20 + 16.

➙ 36.

Therefore, The Value of this expression = 36.

Extra Knowledge :-

• To Calculate these type of questions, just put the value of x, y or any variable to get your answer.

• The signs of that number are changed, means, when we do the square of a number, it's sign changes into positive, and when we do the cube, it remains negative.