Question

Find the sum of 4x3 + 2x2 - 4x + 3 and 7x3 -4x2 + 7x + 8

Answer 1

11x³ - 2x² + 3x + 11

Explanation:

For summation of these variables we should always add the coefficient of like power variable.

(4x³ + 2x² - 4x + 3) + ( 7x³ - 4x² + 7x + 8)

⇒ (4 + 7)x³ + (2 - 4)x² + (-4 + 7)x + (3 + 8)

⇒ 11x³ - 2x² + 3x + 11

is our required answer.

Answer 2

11x^3 -2x^2 +3x +11

Explanation:

(4x^3 + 2x^2 - 4x + 3) + (7x^3 -4x^2 + 7x + 8)

= (4+7)x^3 +(2 -4)x^2 +(-4+7)x +(3 +8) . . . . add the coefficients of like terms

= 11x^3 -2x^2 +3x +11