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The perimeter of a right-angled triangle is 72 cm. The lengths of its sides are in the ratio 3 : 4 : 5 Work out the area of the triangle.

72 / (3+4+5) = 6base :36 = 18height :46 = 24area = (base * height) /2area = (18*24)/2=216 cm ^2

Answered by Ibrahim H. • Maths tutor
2340 Views

Solve x^2+6x+1=0 by completing the square

x2+6x+5=0 First of all half the x coefficient and write (x+6/2)2 the take away the (6/2)2 and add on the 5
(x+3)2-9+5=0
(x+3)2-4=0 ...

Answered by Ben S. • Maths tutor
7264 Views

Find the equation of the tangent to curve y=5x^2-2x+3 at the point x=0

y=5x2-2x+3 Differentiate to find the equation of the gradient of the curve
dy/dx=10x-2 Substitute x=0 to find the gradient at the point x=0
dy/dx=-2

y=50^2-2

Answered by • Maths tutor
4774 Views

Expand 4e(e + 2)

4e^2 + 8e

Answered by • Maths tutor
16164 Views

Factorise and solve the quadratic : 3x^2 + 15x +18 = 0

First we look to see if there is a common factor in the equation. In this case there is a common factor of 3, therefore we can take 3 out as a factor. 3(x2 +5x +6) = 0
The inside of the br...

Answered by Holly W. • Maths tutor
3795 Views

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