Simplify (11x^2+5y^2-8xy)+(x^2-7y^2+4x)

$(11 x^{2} + 5 y^{2} - 8 x y) + (x^{2} - 7 y^{2} + 4 x)$

Step 1

Remove parentheses.

$11 x^{2} + 5 y^{2} - 8 x y + x^{2} - 7 y^{2} + 4 x$

Step 2

Add $11 x^{2}$ and $x^{2}$ .

$12 x^{2} + 5 y^{2} - 8 x y - 7 y^{2} + 4 x$

Step 3

Subtract $7 y^{2}$ from $5 y^{2}$ .

$12 x^{2} - 2 y^{2} - 8 x y + 4 x$