Based on the equation you gave me, this should be your answer.
The value of x is √2.5
<h3>How to solve arithmetic?</h3>
Arithmetic can be solved by using PEMDAS rule.
P = parenthesis
E = exponential
M = Multiplication
D = division
A = addition
S = Subtraction
Therefore,
12 - 4 + 5x² = 20
12 - 4 + 5x² = 20
8 + 5x² = 20
5x² = 20 - 8
5x² = 12
x² = 12 / 5
x = √2.4
learn more on arithmetic here: brainly.com/question/2880880
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The answer is 14 because a negative number multiplied by another negative number is positive. So (-7)*(-2) is 14.
