7a+3b=27 6a+3b=24 Solve in simultaneous A= B=
2 answers:
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Answer:
D
Step-by-step explanation:
Given
x² - 10x = - 36
Solve using the method of completing the square
add ( half the coefficient of the x- term )² to both sides
x² + 2(- 5)x + 25 = - 36 + 25
(x - 5)² = - 11 ( take the square root of both sides )
x - 5 = ± ( add 5 to both sides )
x = 5 ± i
Thus
x = 5 - i or x = 5 + i
The answer is C.
The expression is telling you to multiply the parenthesis times four. When you multply two numbers, , it means that you're considering
"copies" of
, or if you prefer,
repeated
times.
So, you have
<- this is twice as much as the parenthesis
<- this is three times as much as the parenthesis
<- this is four times as much as the parenthesis