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Using the quadratics formula find the two solutions to x^2 + 3x + 2 = 0.

x 1 = (-b + (b 2 - 4ac) 1/2 )/2a and x 2 = (-b - (b 2 - 4ac) 1/2 )/2a. So with the values a = 1, b = 3 and c = 2: x 1 = (-3 + (3 2 - 8) 1/2 )/2 and x 2 = (-3 - (3 2 - 8) 1/2 )/2, x 1 = (-3 + 1)/2 = -1 and x ...
RD
Answered by Rebecca D. • Maths tutor
4180 Views

Starting with x^2+2x+1=0 use the method of factorising to solve for x.

x 2 +2x+1=0, (x+1)(x+1)=0, (x+1) 2 =0. So x=-1
RD
Answered by Rebecca D. • Maths tutor
4484 Views

How do I make sure I know all my vocab?

I recommend using study cards. Write down the spanish word on one side and the english word on the other side. Set yourself the task of learning 5 words a day and ask someone to test you.
EC
Answered by Ellie C. • Spanish tutor
2325 Views

Aluminium is protected from rust by a layer of oxidised Al2O3. Can you write a balanced equation for the formation of this layer?

To form Al2O3 you need both Al and O2 (oxygen gas is a dimer): Al + O2 -> Al2O3 But this equation is not balanced. To balance it, first equate the number of oxygen atoms: Al + 3O2 -> 2Al2O3 Now you hav...
JB
Answered by Jessica B. • Chemistry tutor
3548 Views

How do I say I don't like maths because its difficult?

No me gustan las matemáticas porque son difíciles.
IS
Answered by Itxaso S. • Spanish tutor
3999 Views