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Draw a graph and clearly label any x and y intercepts for the equation y=x^2+6x+9

Step 1: Factorise the equation either directly or by using the quadratic formulae {[-b(+/-)sqrt(b^2-4ac)]/2a}. This equation can be factorised directly since 3*3=9 (for the last term on the RHS) and 3+3=6 (f...
EY
Answered by Emad Y. • Maths tutor
4472 Views

Calculate dy/dx for y=x(x−1)

y=x(x−1)y= x^2-xdy/dx= 2x-1
BS
Answered by Bella S. • Maths tutor
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What is an isotope?

Atoms of the same element with different numbers of neutrons
BS
Answered by Bella S. • Chemistry tutor
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What is active transport?

The movement of molecules against their concentration gradient (low concentration to high concentration), across a membrane using energy.
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Answered by Bella S. • Biology tutor
3102 Views

I struggle with simultaneous equations, when you have a quadratic involved

Example solve the following, equation 1: x 2 +2y=9 equation 2: y=x+3In this example we have to use substitution, therefore we sub in equation 2 into 1 to get the following x 2 +2(x+3)=9 , now we must expand ...
BF
Answered by Benjamin F. • Maths tutor
3337 Views