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Find the roots of x^2+5x+4=0

(x+4)(x+1)=0 x=-1 x=-4
CD
Answered by Christian D. • Maths tutor
3738 Views

Prove that the lines 2y=3-x and y-2x=7 are pependicular.

We can find out whether lines are perpendicular by comparing their gradients. Each gradient should be the negative reciprocal of the other - for example, 3/2 and -2/3, or 4 and -1/4. (Writing the number as a...
PM
Answered by Pranavi M. • Maths tutor
4020 Views

Solve 3x - 5 < 16

The first thing you should always do when approaching questions like this is to get the numbers on one side and the letters on the other. This makes the equation simpler and helps you to solve it. By adding ...
DS
Answered by Dannielle S. • Maths tutor
17113 Views

z = 3x + 5y, if x = 7 and z = 41, what is 2y?

z = 3x + 5y 41 = 3(7) +5y 41= 21 + 5y 20 = 5y 4 = y y = 4 2y = 8
HA
Answered by Hannah A. • Maths tutor
4371 Views

How can I solve quadratic equations by completing the square?

When we have a quadratic (ax 2 + bx + c = 0) we can &quot;complete the square&quot; to solve for x. For example x 2 + 8x + 7 = 0. First look at the x 2 + 8x, in particular the coefficient of x, &quot;b&quot;...
TB
Answered by Thomas B. • Maths tutor
4088 Views