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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
4029 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
5566 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
3404 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
28101 Views

What exactly is pi?

Pi is the ratio between a the circumference and the diameter of a circle. It's just a number which happens to describe this ratio for any circle you can think of. Let me explain, using the whiteboard...
HB
Answered by Harry B. • Maths tutor
3334 Views