Answer:
x^2 + 5x - 84 = 0
x = 7
Step-by-step explanation:
let the sister's age = y
sister's age (y) = 5 + x equation 1
xy = 84 equation 2
Make y the subject of the formula in equation 2
y = 84/x
equate equation 1 and 2
84/x = 5 + x equation 3
Multiply equation 3 by x
84 = 5x + x^2
x^2 + 5x - 84 = 0
tjis can be solved using quadratic equation
x^2 -7x + 12x -84 = 0
x(x + 12) -7(x + 12)
x = 7 or - 12
age cant be negative so his age is 7
Answer:
“My head was pounding. It was like my insides had swollen so much they were pushing on my skull.”
Step-by-step explanation:
Our goal is to get x by itself to find the value so
First we multiply 10 to both sides
S - 31 = 60
Then add 31 to both sides to get a
s = 91
Hope this helps!
Answer: (x+5)*(x+2)
Step-by-step explanation:
1: Write as a sum
x^2+7x+10
2: Factor the expressions
x^2+5x+2x+10
3: Factor the expression
x(x+5)+2(x+5)
Answer: (x+5)(x+2)
Hope this helps!
Answer:
C I belive, (-2,-3)
Step-by-step explanation:
