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What is the general equation for a straight graph line and what does each part represent?

Y= mX + c, 'X' is the horizontal value on the axis, the input value. The 'm' represents the gradient of the line, figured out by the change in y divided by the change in x. The 'c' value is the y intercept, ...
TW
Answered by Toby W. • Maths tutor
3614 Views

Find the range of values of x for which: x^2 + 3x + 2 < 0

If you were to factorise this quadratic to find out its roots, you would get: (x+1)(x+2) which gives us roots of -1 and -2. Remember that roots are where the graph crosses the x-axis, and are found by settin...
TN
Answered by Thomas N. • Maths tutor
6386 Views

Solve x^2+8x-5 = 0 by completing the square.

x 2 + 8x = (x + 4) 2 - 16, so x 2 + 8x - 5 = (x + 4) 2 - 16 - 5 = (x + 4) 2 - 21, so then (x + 4) 2 - 21 = 0 (x + 4) 2 = 21 -----&gt; x + 4 = √21 -------&gt; x = -4 + √21 x = -4 - √21
SJ
Answered by Shadab J. • Maths tutor
12814 Views

Find an equation of the straight line that is perpendicular to the straight line x + 3y = 7 and that passes through the point (4,9).

y = 3x - 3
VP
Answered by Vikesh P. • Maths tutor
3819 Views

solve: x^2= 4(x-3)^2

x^2= 4(x^2 - 6x + 9) x^2= 4x^2- 24x + 36 3x^2 - 24x + 36= 0 (x-2)(x-6)=0 x= 2 or x=6
GK
Answered by Ghazn K. • Maths tutor
3749 Views