Algebra 1

4 marks · Normal

The expression is given.

(a)

Collect like terms to simplify the expression.

[2 marks]

(b)

Evaluate your simplified expression when .

[2 marks]

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(a) 3x^2 + 8x + 7

(b) -28

Show mark scheme and worked solution

Marking points

M1 (a) · 1 mark · M: Collecting like terms for and constant terms

A1 (a) · 1 mark · A: Simplified expression

M2 (b) · 1 mark · M: Correct substitution of (follow-through)

A2 (b) · 1 mark · A: Correct final value for part (b), follow through allowed from (a) (follow-through)

Worked solution

a) Collect terms and arrange the rest:

b) Substitute :

(However, correct calculation must be:-)