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h^2=25. solve this quadratic equation to find h.

h 2 = 25So firstly, we must square root each side of the equation.(square root) h 2 = (square root)25.so... h= (square root)25.h=5. or h=-5.
HS
Answered by Helen S. • Maths tutor
4125 Views

(2x-5)(3x+2)(x+7) - Expand the brackets.

(6x^2+4x-15x-10)(x+7)(6x^2 -11x-10)(x+7)= 6x^3-11x^2-10x+42x^2-77x-70)=6x^3+31x^2-87x-70
GA
Answered by Gloria A. • Maths tutor
5654 Views

What is the determinant of a 2 by 2 matrix?

Let A by any 2 by 2 matrix and the top left, top right, bottom left and bottom right entries be a, b, c and d respectively. The determinant for matrix A would be ad-bc.
LG
Answered by Lin G. • Maths tutor
4240 Views

Make x the subject of the equation. 7xy+6 = 18x+3y+7

Put all the terms which contain x onto one side of the equation.-6 from both sides of the equation and -18x from both sides of the equation to get7xy-18x = 3y+7-6Simplify if possible7xy-18x = 3y+1Take the x ...
LM
Answered by Lucy M. • Maths tutor
3479 Views

Prove that the sum of four consecutive whole numbers will always be even.

First, check you understand what the question's asking by determining the key words. Next, try a couple of examples to convince yourself that the statement does in fact work, i.e 1+2+3+4=10, which is even. N...
EB
Answered by Emma B. • Maths tutor
28271 Views