The first step to solve a quadratic expression that's not set to zero is to solve the equation so that it is set to zero:

a² - 4a + 1 = -5a + 3
a² - 4a + 1 - 3 = -5a
a² - 4a + 5a - 2 = 0
a² + a - 2 = 0

Next, factor the quadratic equation:

a² + a - 2 = 0
(a - 1)(a + 2) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (a - 1) or (a + 2) must equal zero:

If (a - 1) = 0, a must equal 1
If (a + 2) = 0, a must equal -2

So the solution is that a = 1 or -2

An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.

The area of a triangle is equal to ½ base x height:

a = ½bh
a = ½ x 9 x 4 = \( \frac{36}{2} \) = 18

A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).

To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

(8a)(5ab) - (7a²)(2b)
(8 x 5)(a x a x b) - (7 x 2)(a² x b)
(40)(a¹⁺¹ x b) - (14)(a²b)
40a²b - 14a²b
26a²b