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quadratic.rkt
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quadratic.rkt
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#lang racket
(require casio/test)
; quadratic formula
(casio-test (a b c)
"NMSE p42"
(let* ((d (sqrt (- (* b b) (* 4 (* a c))))))
(/ (+ (- b) d) (* 2 a)))
(let* ((d (sqrt (- (* b b) (* 4 (* a c)))))
(r1 (/ (+ (- b) d) (* 2 a)))
(r2 (/ (- (- b) d) (* 2 a))))
(if (< b 0)
r1
(/ c (* a r2)))))
(casio-test (a b c)
"NMSE p42"
(let* ((d (sqrt (- (* b b) (* 4 (* a c))))))
(/ (- (- b) d) (* 2 a)))
(let* ((d (sqrt (- (* b b) (* 4 (* a c)))))
(r1 (/ (+ (- b) d) (* 2 a)))
(r2 (/ (- (- b) d) (* 2 a))))
(if (< b 0)
(/ c (* a r1))
r2)))
(casio-test (a b/2 c)
"NMSE problem 3.2.1"
(let* ((d (sqrt (- (* (* 2 b/2) (* 2 b/2)) (* 4 (* a c))))))
(/ (+ (* -2 b/2) d) (* 2 a))))
(casio-test (a b/2 c)
"NMSE problem 3.2.1"
(let* ((d (sqrt (- (* (* 2 b/2) (* 2 b/2)) (* 4 (* a c))))))
(/ (+ (* -2 b/2) d) (* 2 a))))