a. Find the set of values of x for which 4x 2 + 19x - 5

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a. Find the set of values of x for which 4x² + 19x - 5 ≤ 0.

b. i. Express x² + 8x - 9 in the form (x + a)² + b. where a and b are integers.

ii. Use your answer to part i to find the greatest value of 9 - 8x - x², and the value of x at which this occurs.

iii. Sketch the graph of y = 9 - 8x - x², indicating the coordinates of any points of intersection with the coordinate axes.

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Cambridge IGCSE And O Level Additional Mathematics Coursebook

ISBN: 9781108411660

2nd Edition

Authors: Sue Pemberton

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Question Posted: Aug 17, 2021 06:25 AM

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a. Find the set of values of x for which 4x 2 + 19x - 5

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a 4x 19x5 0 4x 20xx5 0 4xx 51 x 5 0 x5 4x 1 0 The critical values arce ...View the full answer

Cambridge IGCSE And O Level Additional Mathematics Coursebook

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