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How do you solve the quadratic X^2 - 8X + 15 = 0 ?

First factorise (using a "farmer's field", will draw this on whiteboard):=> (X-3)(X-5) = 0Hence using the zero rule (one of the brackets must be equal to 0 if the product is 0),either X-3 = 0 OR...
SJ
Answered by Simone J. • Maths tutor
3006 Views

2x^2+21x=-40

2x 2 +21x+40=0factors of 40=1&40, 2&20, 4&10, 5&85 & 8 are correct factors as 5 + 2*8 = 21(2x+5)(x+8)=0So, x = -8 & -2.5
NM
Answered by Nirav M. • Maths tutor
3459 Views

Prove that the decimal 0.303030... (recurring) has the value of 10/33

Let x = 0.303030... We do not want to deal with a recurring decimal, and so we want to cancel this out. The easiest way to do this is to multiply x by 10 and this means we multiple our decimal by 10 until we...
RS
Answered by Raz S. • Maths tutor
3543 Views

given that (x+8)^2-62=ax^2+bx+c find the values of a,b and c (3 marks)

For this question, the main component of the equation we need o look at is (x+8)^2. We know that (x+8)^2 is the same as (x+8)(x+8). First we have to expand these brackets. For his I make small table to ensur...
NJ
Answered by Neyha J. • Maths tutor
2863 Views

Calculate the length of side AB (opposite) in a right angled triangle, where angle C is 32 degrees and length of BC (hypotenuse) is 8cm.

First, we can draw a diagram to visualise the triangle and the elements of the question. Looking at this, we can see that we know the length of the hypotenuse (H) and we need to calculate the length of the o...
PA
Answered by Prachi A. • Maths tutor
4130 Views