Solve 15=3(-1)^2+2A(-1)

$$15 = 3 ( - 1 ) ^ { 2 } + 2 A ( - 1 )$$

Solve for A

$$A=-6$$

Steps for Solving Linear Equation

Calculate -1 to the power of 2 and get 1.

$$15=3\times 1+2A\left(-1\right)$$

Multiply 3 and 1 to get 3.

$$15=3+2A\left(-1\right)$$

Multiply 2 and -1 to get -2.

$$15=3-2A$$

Swap sides so that all variable terms are on the left hand side.

$$3-2A=15$$

Subtract 3 from both sides.

$$-2A=15-3$$

Subtract 3 from 15 to get 12.

$$-2A=12$$

Divide both sides by -2.

$$A=\frac{12}{-2}$$

Divide 12 by -2 to get -6.

$$A=-6$$