alleryStart learning →Which is the correct simplification of 3x + 4x?
A7x²
B7x
C12x²
D12x
Answer & Solution
Correct answer: B. 7x
Like terms add their coefficients and the letter part stays x, so 7x.
Keep practising Expressions Using Letter-Numbers
Browse all Expressions Using Letter-Numbers questions for Olympiad (Class 7), or explore more Mathematics topics.
Related questions
A chain of n triangles uses 2n + 1 sticks. With 25 sticks, n isIf p = 2q, the expression 3p + 2q equalsA notebook costs n and a pen costs p. Cost of 3 notebooks and 2 pens?A taxi charges ₹20 plus ₹12 per km. Fare for d km isFencing costs ₹15 per metre. A square plot has side s m. Cost of fencing?A triangle has sides x, x + 2 and 2x - 1. Its perimeter isAdd (3x + 2y) and (4x - 5y).Find x - (y - z) when x = 10, y = 7 and z = 2.