Top answers

Solve the simultaneous equations 8x+2y=34 and 4x+2y=18

1.Simplify the two equations: 4x+y=17and 2x+y=9. 2. Rearrange one of the equations to make y=: y=9-2x. 3.Substitute into other equation:4x+9-2x=17. 4. Simplify:2x=8 x=4. 5.Substitute back into either of the ...
LM
Answered by Lara M. • Maths tutor
4071 Views

Solve the quadratic: 3x^2+4x = 20 to find x.

Quadratic formula: where ax^2+bx+c =0, x = (-b±√(b^2-4ac))/2a.Rearrange the formula in the question to get 3x^2+4x-20 = 0.From the quadratic in the question we can see that a = 3, b = 4, c = -20.Therefore x ...
SF
Answered by Samuel F. • Maths tutor
6257 Views

Differentiate the following: 2x^2 + 3x -2

The correct answer is: 4x+3. The first part of the equation is differentiated by multiplying the power by the constant in front (2*2). The power is then reduced by one to x^1 (which is just x). This is repea...
TB
Answered by Tilly B. • Maths tutor
3761 Views

Solve the following for x: 2x^2-9x=5

The format of this question shows that it is a quadratic, which we can solve by factorising . We have 3 methods by which we can do this:First, we need to manipulate the equation into the form ax^2+bx+c. Subt...
NP
Answered by Noah P. • Maths tutor
4745 Views

Solve the following simultaneous equations: 3x + y = 11 2x + y = 8

Start off by determining which unknowns have the same coefficient- In this case it would be y as the coefficient of y is 1 in both equationsThen make both equations equal to y- So 3x+y= 11 would become y= 11...
AR
Answered by Amelia R. • Maths tutor
4604 Views