Find the value of the following expession at a = 1 and b = −2:

a² + b² + 3ab

Question

Question

This question was previously asked in

Bihar STET Paper I: Mathematics (Held In 2019 - Shift 1)

Answer 1

Calculations:

To find the value of the expression a² + b² + 3ab for a = 1 and b = -2, we substitute the given values into the expression.

a² + b² + 3ab = (1)² + (-2)² + 31(-2)

= 1 + 4 - 6 = -1

So, the value of the expression at a = 1 and b = -2 is -1.