15+7r+r(r-3)-r*r=

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Solution for 15+7r+r(r-3)-r*r= equation:


Simplifying
15 + 7r + r(r + -3) + -1r * r = 0

Reorder the terms:
15 + 7r + r(-3 + r) + -1r * r = 0
15 + 7r + (-3 * r + r * r) + -1r * r = 0
15 + 7r + (-3r + r2) + -1r * r = 0

Multiply r * r
15 + 7r + -3r + r2 + -1r2 = 0

Combine like terms: 7r + -3r = 4r
15 + 4r + r2 + -1r2 = 0

Combine like terms: r2 + -1r2 = 0
15 + 4r + 0 = 0
15 + 4r = 0

Solving
15 + 4r = 0

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-15' to each side of the equation.
15 + -15 + 4r = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 4r = 0 + -15
4r = 0 + -15

Combine like terms: 0 + -15 = -15
4r = -15

Divide each side by '4'.
r = -3.75

Simplifying
r = -3.75

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