Question #61e9a
2 Answers
May 1, 2017
x=3,-5
Explanation:
By Pythagoras, we have:
AB^2 = (x-(-1))^2 + (7-4)^2
And so:
5^2 = (x+1)^2 + 3^2
:. 25 = x^2+2x+1+9
:. x^2+2x-15=0
:. (x+5)(x-3)=0
Leading to the two possible solutions:
x=3,-5
May 1, 2017
x = 3 or -5
Explanation:
Find the distance between A and B in terms of x and equate it to 5.
To do that, we use Pythagoras' Theorem.