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How can you differentiate when to use SohCahToa and when to use the sine/cosine rules?

SohCahToa We use SohCahToa to figure out an unknown angle or side in a right angled triangle. In questions, you will see a right angled triangle and have either two sides given (so you can calculate an angle...
MC
Answered by Mansi C. • Maths tutor
20884 Views

x – 7x + 10 = 0

Equation of this type should be seen as x 2 -SX+P=0, where S is the sum of the solutions, while P is their product. We have too find 2 numbers whose sum is S and product is P. In this example, we have S=7 an...
AE
Answered by Anca Elena M. • Maths tutor
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Solve (x+1)/3+(2x+5)/4=2

Identify a common denominator4( x + 1)/12 + 3(2 x + 5)/12 (= 2)2. Expand both brackets(4 x + 4)/12 + (6 x + 15)/12 = 23. Multiply out the denominator4 x + 4 + 6 x + 15 = 12× 24. X's on one side, numbers on t...
MK
Answered by Modesta K. • Maths tutor
5142 Views

How do you factorise quadratic equations by completing the square?

Divide the term in x by 2 and then put it in the bracket which will be squared. The last term from that expansion needs to be adjusted for.
DM
Answered by Dario M. • Maths tutor
3550 Views

Expand: (3x-1)(x+5)(4x-3)

(3x^2+14x-5)(4x-3)= 12x^3-9x^2+56x^2-42x-20x+15=12x^3+47x^2-62x+15
WH
Answered by William H. • Maths tutor
7888 Views