Answer:
x = 3 or -7
Step-by-step explanation:
Recall that for a quadratic equation in the form:
Ax² + Bx = C
we need to add (B/2)² to both sides of the equation to
In our case, we are given:
x² + 4x = 21
compared to the general equation above, B = 4, hence we need to add (4/2)² to both sides
x² + 4x = 21 (complete the square)
x² + 4x + (4/2)² = 21 + (4/2)²
x² + 4x + 2² = 21 + 2²
(x+ 2)² = 21 + 4
(x+ 2)² = 25 (take square root of both sides)
(x+2) = ±√25
(x+2) = ±5
hence
(x+2) = +5----> x = 5 - 2 = 3 (answer)
or
(x+2) = -5 ----> x = -5 - 2 = -7(answer)
Answer: y= 7 & y=5
Step-by-step explanation:
y^2-12 get half of -12 which is -6 then sq it -6 X -6 = 36 add to both sides
y^2 -12+36= -35+36
(y-6)^2= 1
Sq rt both sides
y-6=1
Add 6 to both sides
Y= 7
Y-6=-1
Add 6
Y=5
Answer: 1/85
Step-by-step explanation: easy put 85 over 1
1/85
Answer:
2(m-3)+7 > 11
Step-by-step explanation:
It'll be A
hope this helps!
