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What do you understand by this equation?
How do you expand brackets? Grid/smiles and eyebrows
How confident are you with factors and times ...
Rearrange the first equation to give b as the subject.
b = 16 - 6a
Then substitute that equation for b into the second equation.
5a - 2(16 - 6a) = 19
Simplify this equation (re...
Firstly, let's move the x^3's onto the same side (and preferably keep them positive). Let's add x^3 to both sides, which means the RHS will now read '2x^3 - 25' and the LHS will read '103'. Next we wan...
Equation A: 2x + 5y = 8
Equation B: 4x + y = 7
2A: 4x + 10y = 16
2A - B: 9y = 9, Therefore y = 1
Sub y back into equation A to find x: 2x + 5 = 8, 2x ...
times both sides by both denominators
= (2x+3)(2x+1) - (2x-8)(x-4) = (2x+1)(x-4)
times out brackets
= (4x2 + 8x +3) - (2x2 -16x +32) = 2x2 -7x -4
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