Answer:
x = ±7
Step-by-step explanation:
x² - 7 = 42
add 7 to both sides
x² = 49
take the square root of both sides
x = ±7
Answer:
x^2 - 7 = 42
step 1 add 7 to both sides to get i.e the minius 7 on the left becomes plus seven in the right.
42 + 7 = 49 to give
x^2 = 49
then take the square root of 49 as X is squared in the left
to give X = 7
