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3 years ago

How do we solve an equation by factoring?Problems such as x² - 9 = 0 and x² + 13x = -36.

1 answer:

6 0

$1.\\x^2-9=0\\
Using\ formula:\\
a^2-b^2=(a-b)(a+b)\\
x^2-9=0\\
x^2-3^2=0\\
(x-3)(x+3)=0\\\\
Asnwer:\ \ x^2-9=(x-3)(x+3)\\\\2.\\x^2+13x=-36\\
x^2+13x+36=0\\ Write\ 13x\ as\ 9x+4x\\x^2+9x+4x+36=0\\ x(x+4)+9(x+4)=0\\(x+4)(x+9)=0\\\\Answer:\ \ x^2+13x+36=(x+4)(x+9)$

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Solve the inequality <br> x - 4/5 > 1/5

ahrayia [7]

x - 4/5 > 1/5

+4/5 +4/5 add 4/5 on each sides, 4/5s will cancel on the left side.

__________ solve for 1/5 + 4/5, which is 1.

x > 1, is the final answer.

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3 years ago

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F(x) = 2x+1/×-1 find the inverse function

denis23 [38]

To factor this, start by replacing x with y and then solve for y
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3 years ago

Jan's age is three years less than twice tritts age. The sum of their ages is 30. Find their ages.

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vfiekz [6]

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Yes

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