Solve t^2-t=3(7+t)
Expand RHS: t2 - t = 21+ 3tCollect all terms on one side: t2 - 4t - 21 = 0Factorise and solve by inspection / use the quadratic formula to solve for t: (t + 3)(t - 7) = 0 / t = [ -(-4) ± ( (-4)2 - 4x(1)x(-21) )1/2 ] / 2(1)t = -3, t = 7
CW
Related Maths GCSE answers
All answers ▸Solve x^2+6x+5=0 for x
Solve the quadratic equation x^2+5x+6=0
There is a bag of blue, red, and white counters. 1/6 of the bag is blue counters. 1/4 of the bag is red counters. What is the smallest number of white counters that could possibly be in the bag.
A linear equation has terms: a+2b, a + 6b, a + 10b, ......., ........ the second term equals 8 and the fifth term equals 44. Work out the value of a & b