Simplify 11x+2x^2--7x-3x^2+4

$11 x + 2 x^{2} - - 7 x - 3 x^{2} + 4$

Step 1

Replace all occurrences of $-$ $-$ with a single $+$ . Two consecutive minus signs have the same mathematical meaning as a single plus sign because $- 1 \cdot - 1 = 1$

$11 x + 2 x^{2} + 7 x - 3 x^{2} + 4$

Step 2

Add $11 x$ and $7 x$ .

$2 x^{2} + 18 x - 3 x^{2} + 4$

Step 3

Subtract $3 x^{2}$ from $2 x^{2}$ .

$- x^{2} + 18 x + 4$

Simplify 11x+2x^2--7x-3x^2+4

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