Question
If 4x + y = 18 and xy = - 10, what is the value of 4x -
y?Solution
4x + y = 18 and xy = -10
(4x - y) 2 Â = (4x + y) 2 Â - 4(4x)(y)
(4x - y) 2 Â = (18) 2 Â - 16 (-10)
(4x - y) 2 Â = 22 2
4x - y = 22
- If (725 – 700 + 175) ÷ 5 + √1225 = x, then {(x/2) + 20} = ?
If x = (2+√3)/(2-√3), y = (2-√3)/(2+√3). Then find out the value of (x²+y²-xy)/(x²+y²+xy)?
Find ‘x’ if (x³+3x)/(3x²+1) = 189/61
If x + y + z = 30, x² + Y² + z² = 460 and x z = y², then find the value of x z?
If x² + px + q = 0 has roots 4 and -3, find the values of p and q.
if a2 + b2 + c2Â =Â 2(4a -5b -6c)-77 , then a-b-c = ?
If a² + c² + 17 = 2(a - 8b - 2c²), then what is the value of (a³ + b³ + c³)?
The mean age of 30 students was calculated as 15 years. However, it was later discovered that one student's age was mistakenly entered as 15 years inste...