Solve -0.0031*(21^2)+0.1561*21-1.1188=x

$$-0.0031 \times ( { 21 }^{ 2 } )+0.1561 \times 21-1.1188=x$$

Solve for x

$$x=0.7922$$

Steps for Solving Linear Equation

Calculate 21 to the power of 2 and get 441.

$$-0.0031\times 441+0.1561\times 21-1.1188=x$$

Multiply -0.0031 and 441 to get -1.3671.

$$-1.3671+0.1561\times 21-1.1188=x$$

Multiply 0.1561 and 21 to get 3.2781.

$$-1.3671+3.2781-1.1188=x$$

Add -1.3671 and 3.2781 to get 1.911.

$$1.911-1.1188=x$$

Subtract 1.1188 from 1.911 to get 0.7922.

$$0.7922=x$$

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

$$x=0.7922$$