The square of 2 more than a no. is the same as 4 less than 10 times the no. Find the no's
Mary is 15 yrs. older than her sister Jane. Six years ago Mary was six times as old as Jane. Find their present ages.
2006-10-11 11:07:13 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
The sq of 2 more than a # = (x+2)^2
4 less than 10 times the # = 10x-4
So... (x+2)^2 = 10x-4
Mary is 15 yrs older than Jane... M=J+15
Six yrs ago Mary was 6 times as old as Jane.... M-6=6J
2006-10-11 11:11:12 · answer #1 · answered by marcush722 1 · 1⤊ 0⤋
First one: set up 2 equal equations i.e if x is the number we want to find (x+2)^2=10x-4 then just rearrange and solve the quadratic
2nd one is similar M is mary, J is Jane
m=j+15
m-6=6j then substitue to solve
Hope that helps!
2006-10-11 18:13:04 · answer #2 · answered by Gina7 1 · 0⤊ 0⤋
1. (x+2)^2 = 10x-4
2. m = j + 15
m - 6 = 6j
2006-10-11 18:16:48 · answer #3 · answered by JennyAnn 4 · 0⤊ 0⤋