What is (x+7)(x-7)-(x-6)(x+6)+13 ?

The solution to (x+7)(x-7)-(x-6)(x+6)+13 is 0

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simplify (x+7)(x-7)-(x-6)(x+6)+13

simplify

(x + 7) (x - 7) - (x - 6) (x + 6) + 13

0

Solution steps

(x + 7) (x - 7) - (x - 6) (x + 6) + 13

Expand

(x + 7) (x - 7) : x^{2} - 49

= x^{2} - 49 - (x - 6) (x + 6) + 13

Expand

- (x - 6) (x + 6) : - x^{2} + 36

= x^{2} - 49 - x^{2} + 36 + 13

Group like terms

= x^{2} - x^{2} - 49 + 36 + 13

Add similar elements:

x^{2} - x^{2} = 0

= - 49 + 36 + 13

Add the numbers:

- 49 + 36 + 13 = 0

= 0

5 \frac{1}{3} \div \frac{1}{2}

(2 x - 3 y + z) a + (3 y - 2 x - z) b

(4 + h)^{2}

83!

\frac{7}{7 ^{\frac{1}{4}}}

What is (x+7)(x-7)-(x-6)(x+6)+13 ?
The solution to (x+7)(x-7)-(x-6)(x+6)+13 is 0