Answer:
x = -7 or 7
Step-by-step explanation:
x² - 49 = 0
→ Factorise
( x + 7 ) ( x - 7 )
→ Solve
x = -7 or 7
Answer:
a = 3
Step-by-step explanation:
Hope that helps :)
I figured out the first question, the second one in lost on.
Factor both of the equations, numerator and denominator
Cancel the like factors *excuse the zero im just showing you*
Combine frunctions
x-9=0
x+7=0
Restrictions are 9 and -7
One centimeter equals 10 millimeters, therefore 90 times 10 equals to 900 millimeters. Your answer is 900 millimeters.