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3 years ago

Solve by factorising x^2 + 8x + 15 = 0

Mathematics

1 answer:

Nutka1998 [239]3 years ago

3 0

Answer:

See below

Step-by-step explanation:

x² + 8x + 15 = 0

x² + 5x + 3x + 15 = 0

x x (x + 5) + 3x + 15 = 0

xx (x + 5) +3 (x + 5) = 0

(x + 5) × (x + 3) = 0 → x + 5 = 0 x + 3 = 0

x = -5

x + 3 = 0

x = -5

x = -3

x1 = -5

x2 = -3

Hope this helped ! :)

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4 years ago

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algol [13]

Answer:

Solving for the variable, x: $x = \frac{1}{3}y + \frac{2}{3}$

Solving for the variable, y: $y = 3x - 2$

Step-by-step explanation:

IF:

You are solving for the variable, x. Note the equal sign, what you do to one side, you do to the other. Isolate the variable, x. First, follow PEMDAS, then do the opposite of PEMDAS.

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Next, solve for x. Add 2y to both sides:

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Next, divide 6 from both sides:

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IF:

You are solving for the variable, y. Note the equal sign, what you do to one side, you do to the other. Isolate the variable, y. First, follow PEMDAS, then do the opposite of PEMDAS.

First, distribute 2 to all terms within the parenthesis:

(3x - y = 2) * 2 = (6x - 2y = 4)

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